In vitro total phenolics, flavonoids contents and antioxidant activity of essential oil, various organic extracts from the leaves of tropical medicinal plant Tetrastigma from Sabah

Abstract

The findings show that the extent of antioxidant activity of the essential oil and all extracts are in accordance with the amount of phenolics present in that extract. Leaves of Tetrastigma being rich in phenolics may provide a good source of antioxidant.

Study of total phenol, flavonoids contents and phytochemical screening of various leaves crude extracts of locally grown Thymus vulgaris

“…The present study, the total flavonoids contents of the different organic crude plant extracts were determined by Hossain et al method that are reported as quercetin equivalents [16] . Among the five crude extracts from T. vulgaris, methanol extract was containing highest amount of flavonoids content compounds followed by butanol>chloroform>ethyl acetate>hexane crude extract.…”

“…All these secondary metabolites components showed antioxidant and antimicrobial properties through different mechanism. Normally these secondary metabolites components were isolated from the polar plant extract [16] . The phytochemical screening of hexane, ethyl acetate, chloroform, butanol, methanol crude extracts from dry powder leaves samples of T. vulgaris used in this present study.…”

“…Therefore, the detected different bioactive compounds in the different crude may be responsible for the antibacterial activity of the plant crude extracts. Several authors already reported on flavonoids groups exhibited a wide range of biological activities such as antioxidant, anti-inflammatory, antimicrobial, anti-angionic, anticancer and anti-alergic [15][16][17][18][19][20][21] . Saponins are other type bioactive chemical constituents which are involved in plant disease resistance because of their antimicrobial activity [17] .…”

“…The total flavonoids contents of different crude extracts were estimated by aluminium chloride colorimetric method as described by Hossain et al [16] . Sodium nitrate (2.5 g) was taken in a volumetric flash (50 mL) and added water upto the mark that was 5% sodium nitrate.…”

Antioxidant and cytotoxic activity of Acanthus ilicifolius flower

“…For instance lupeol, α amyrin, olcanolic, and ursolic acids [21] . The flower of A. ilicifolius contained saponin and triterpenoidal saponin and these compounds have been found in the root of A. ilicifolius [27][28][29][30][31] . Tiwara et al [32] and Huo et al [33] reported that A. ilicifolius mangrove contained alkaloids i.e.…”